Lemon Fresh Handwash

Indications

• Seborrhoeic dermatitis
• Dandruff
• Scalp psoriasis
• Bacterial infections affecting the scalp

Dosage

Children: For children, apply 3 times a week for 1 week, then apply twice weekly as needed. Refer to BNF for Children for further details.

Adults: Apply to the affected area as directed, typically 1-3 times weekly depending on the condition being treated. Refer to specific product guidelines for detailed dosing.

Mechanism of action

Benzalkonium chloride exerts its antimicrobial effect by disrupting the cell membrane of microorganisms, leading to leakage of cellular contents and ultimately cell death. This is facilitated by its cationic nature, which allows it to bind to negatively charged bacterial surfaces.

Pharmacodynamics

Benzalkonium chloride demonstrates rapid bactericidal activity, with effectiveness observed against gram-positive and gram-negative bacteria, fungi, and some viruses. Its antiseptic properties may be enhanced in the presence of moisture and are typically influenced by the concentration of the solution used.

Pharmacokinetics

Benzalkonium chloride is poorly absorbed through the skin. After topical application, it remains primarily at the site of application, where it exerts localized effects. Systemic absorption is minimal, and it is primarily eliminated through the skin and urine. However, specific pharmacokinetic data may vary based on formulation and application site.

Pregnancy

Benzalkonium chloride should be used with caution during pregnancy. Refer to specific guidelines or consult a healthcare professional.

Breast-feeding

Benzalkonium chloride should be used with caution while breastfeeding. Refer to specific guidelines or consult a healthcare professional.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Shampoo
• Soap or detergent
• Topical solution

Indications

• Disinfection of surfaces
• Antiseptic for skin
• Preservative in pharmaceuticals
• Treatment of minor cuts and abrasions

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations in pediatric populations.

Adults: Refer to the BNF for specific formulations and concentrations as doses may vary based on the application and preparation.

Mechanism of action

The bactericidal action of benzalkonium chloride is believed to result from the disruption of intermolecular interactions, which leads to the dissociation of cellular membrane lipid bilayers in bacteria. This disruption compromises cellular permeability, causing leakage of vital cellular contents. Moreover, the agent can deactivate important molecular complexes such as enzymes that regulate various respiratory and metabolic activities within the cells. Cationic surfactants like benzalkonium chloride can thus effectively disrupt critical intermolecular interactions and tertiary structures in biochemical systems, impairing bacterial function.

Pharmacodynamics

Benzalkonium chloride is classified as a biocidal agent with a relatively long duration of action. It exhibits a spectrum of activity against various microorganisms, including bacteria, certain viruses, fungi, and protozoa; however, it is ineffective against bacterial spores. The agent tends to demonstrate greater efficacy against gram-positive bacteria compared to gram-negative ones. The mode of action can be bacteriostatic (preventing growth) or bactericidal (killing bacteria), depending on its concentration. The activity of benzalkonium chloride is generally stable across different pH levels but is enhanced at elevated temperatures and with extended exposure.

Pharmacokinetics

The pharmacokinetic properties of benzalkonium chloride, including absorption, distribution, metabolism, and excretion, are not fully characterized. Its topical application limits systemic exposure, and it primarily exerts localized effects at the site of application. The duration of action and efficacy may be influenced by the formulation and concentration used.

Pregnancy

Benzalkonium chloride is generally considered safe for use during pregnancy when applied topically, but systemic absorption should be minimized. Always consult a healthcare provider for use during pregnancy.

Breast-feeding

Benzalkonium chloride is considered safe for topical application during breastfeeding, but care should be taken to avoid exposure to the infant. Consultation with a healthcare provider is recommended.

Storage

Store at room temperature, away from moisture and heat. Keep in a tightly closed container, protected from light.

Formulations

• Topical solution
• Disinfectant wipes
• Liquid antiseptics

Indications

• General anesthesia
• Induction of anesthesia
• Sedation in surgical procedures

Dosage

Children: Refer to the BNF for Children for specific dosing information based on age and weight.

Adults: Dosage varies depending on the procedure and patient characteristics; refer to specific clinical guidelines.

Mechanism of action

The exact mechanism of action of diethyl ether is not completely understood. It is believed to produce reversible loss of consciousness through interactions with membrane lipids and hydrophobic regions of membrane-bound proteins. The drug may alter the function of ion channel proteins, potentially affecting the GABA receptor, which is implicated in the modulation of neuronal excitability. Additionally, ether has been shown to increase plasma levels of adrenaline and noradrenaline, suggesting stimulation of neurosympathetic and adrenomedullary functions.

Pharmacodynamics

Ether induces general anesthesia characterized by a reversible loss of sensation and consciousness. Its anesthetic properties are thought to be the result of its effects on neuronal signaling and neurotransmitter systems, primarily by enhancing inhibitory neurotransmission through GABAergic pathways, leading to decreased neuronal excitability and a sedative effect.

Pharmacokinetics

Diethyl ether is rapidly absorbed through the lungs and is distributed widely in body tissues due to its lipophilicity. It is metabolized primarily in the liver, and elimination occurs through exhalation and minor metabolic pathways. The onset of action is swift, with effects seen within minutes of inhalation, and recovery is equally rapid upon cessation of exposure.

Adverse effects

• Nausea
• Vomiting
• Respiratory depression
• Cardiovascular instability
• Hypotension
• Delayed recovery from anesthesia

Interactions

• May potentiate the effects of other central nervous system depressants
• Increased risk of respiratory depression when used with opioids
• Potential interaction with alcohol, leading to enhanced sedation

Precautions

• Use with caution in patients with respiratory or cardiovascular diseases
• Monitor for signs of respiratory depression
• Ensure appropriate equipment and personnel are available for anesthesia

Pregnancy

Use is contraindicated during pregnancy due to potential risks to the fetus.

Breast-feeding

Use with caution; limited data available on excretion in breast milk.

Storage

Store in a cool, dry place, away from heat and direct sunlight. Keep tightly closed.

Formulations

• Inhalation solution
• Liquid for inhalation

Indications

• Cleansing agent in topical formulations
• Emulsifying agent in cosmetic products
• Foaming agent in shampoos and body washes

Dosage

Children: Refer to specific product formulations for appropriate concentrations and application methods.

Adults: Refer to specific product formulations for appropriate concentrations and application methods.

Mechanism of action

Lauryl sulfate functions as an anionic surfactant. It reduces the surface tension between different substances, allowing for better spreading and wetting. In the context of cleansing, it facilitates the removal of dirt and oils from the skin and hair by emulsifying these substances, thus making them easier to rinse away with water.

Pharmacodynamics

As a surfactant, lauryl sulfate displays properties that can disrupt cellular membranes and alter permeability. This mechanism is beneficial in enhancing the penetration of other therapeutic agents in topical formulations. However, its irritant potential on skin and mucous membranes should be noted, as it can lead to dryness and irritation with prolonged exposure.

Pharmacokinetics

Lauryl sulfate is primarily applied topically and is not intended for systemic absorption. When used in formulations, it acts locally at the site of application. Its absorption through the skin is minimal, and any systemic exposure is limited. Metabolism and excretion pathways are not well-defined for topical applications, as it is largely washed away after use.

Pregnancy

Safety during pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Unknown whether lauryl is excreted in human milk. Caution should be exercised when administering to nursing mothers.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Mechanism of action

Although not entirely elucidated, the bactericidal action of benzalkonium chloride is believed to be due to the disruption of intermolecular interactions. Such disruption can cause the dissociation of cellular membrane lipid bilayers of bacteria, resulting in compromised cellular permeability control and the leakage of important cellular contents. Additionally, other important molecular complexes like enzymes which control the maintenance of a great range of respiratory and metabolic cellular activities, are also susceptible to such deactivation. Consequently, a variety of critical intermolecular interactions and tertiary structures in very highly specific biochemical systems that allow bacterial agents to function normally can be readily disrupted or deactivated by cationic surfactants like benzalkonium chloride..

Pharmacodynamics

Benzalkonium chloride solutions are generally categorized as biocidal agents with relative long durations of action. Their spectrum of activity has been demonstrated against bacteria, to some viruses, fungi, and protozoa, although bacterial spores are treated as being resistant to the agent. Additionally, the agent generally shows more activity against gram-positive than gram-negative bacteria. Finally, solutions of benzalkonium chloride are bacteriostatic or bactericidal based on their concentration. Bacteriostatic agents act to prevent further growth of bacterial organisms that are present while bactericidal agents function to kill bacteria that are present. In general, the activity of the agent is not largely affected by pH, but such activity does increase substantially at higher temperatures and prolonged exposure times.

Mechanism of action

The mechanism of action by which .... ethyl ether produce/s/ reversible loss of consciousness is still unclear. Anesthesia can be produced by a wide variety of chemical agents, ranging from inert rare gases to steriodal molecules. This apparent lack of specificity, together with the observation that general anesthesia can be reversed by high pressure, poses a unique pharmacological problem. Most theories concern interaction of anesthetics with either membrane lipids or hydrophobic regions of specificic membrane-bound proteins. One hypothesis is that the anesthetic changes the function of an ion channel protein by modifying the conformation of the protein. Some investigators suggest that the GABA receptor may be the ion channel protein that is affected by inhalation of anesthetic agents... The most appropriate concept for the mechanism of general anesthesia /may be/ a the heterogenous site of anesthetic action, including both lipid and protein membrane components linked with neuronal function. In chronically catheterized rats, diethyl ether increased plasma adrenaline and noradrenaline concentrations indicating that this drug stimulates both neurosympathetic and adrenomedullary functions. These effects appear to be centrally mediated, since ganglionic blockade or spinal transection completely counteracted the diethyl ether induced increases in plasma calcium levels. Hippocampal EEG signals derived from chronically implanted electrodes in the freely moving rat were recorded before and after administration of centrally acting drugs, and analyzed by power and coherence spectra. Diethyl ether induced a low frequency (3-6 c/s) theta power and coherence peak in the immobile rat, which was sensitive to atropine or scopolamine. The residue spectrum, defined as the EEG spectrum with the theta harmonics removed, was sensitive to centrally acting drugs. Diethyl ether suppressed fast waves of 50-100 c/s, and some conditions, enhanced 15-50 c/s waves. The plasma beta-endorphin responses to ether and handling stress were examined in animals of various ages. At each age studied there was a significant, stress-induced elevation of plasma beta-endorphin-like immunoreactivity levels were higher in animals 3,7, and 14 days of age than in adults. Cortical action potential activity is suppressed by ether anesthesia and is not affected when sensory fibers in the sciatic nerve are stimulated. Consequently, ether blocks sensory pathways to the cortex; the blockade occurs even before cortical activity is entirely suspended. In contrast, pentobarbital suppresses activity in the cortex without blocking the sensory path to it during sciatic nerve stimulation.